Printing telegraph motor start-stop mechanism



P. R. SIMMS 3,317,660

May 2, 1967 Filed Aug. 7, 1965 INVENTOR PAUL R. SIMMS BY ML ATTORNEYUnited States Patent 3,317,660 PRINTING TELEGRAPH MOTOR START-STOPMECHANISM Paul R. Simms, Mount Prospect, 11]., assignor to TeletypeCorporation, Skokie, Ill., a corporation of Delaware Filed Aug. 7, 1963,Ser. No. 300,485 8 Claims. (Cl. 1784.1)

This invention relates to motor control circuits for printing telegraphsystems and more particularly to motor start-stop circuits for telegraphprinters.

It is an object of the present invention to simplify the circuits whichcontrol the driving motor of a printing telegraph receiver.

Another object of the invention is to provide a simple and inexpensivemotor start-stop mechanism for a telegraph printer.

-A still further object of the invention is the provision of a simplemotor start-stop circuit for printing telegraph receivers which isresponsive to remotely generated line signals. 7

In accordance with one embodiment of the invention the driving motor ofa printing telegraph receiver is con nected to and disconnected from itscurrent source by one brush of a rotary switch which maybe stepped fromone static position to another by an actuating electromagnet that isnormally held energized in series with the selector magnet of thetelegraph receiver by a marking (current) condition on the telegraphline. A second brush of the rotary switch serves in one of the staticconditions of the switch to connect the actuating electromagnet inseries with the selector magnet and in a second of the static conditionsto disconnect the actuating electromagnet from its series relation withthe selector magnet. The third brush of the rotary switch in itsrespective static conditions, prepares and disables an auxiliary circuitfor the actuating electromagnet for completion by a signal controlledcontact responsive to a predetermined code combination of signalsreceived by the selector magnet.

The actuating electromagnet is rendered operative to step the rotaryswitch from one static position to another upon the receipt in thetelegraph receiver of a spacing (no current) condition on the telegraphline followed by a marking condition on the telegraph line or upon thealternative receipt of the predetermined code combination in thereceiver. A spacing condition on the signal line followed by a markingcondition serves to start the motor through the operation of theactuating electromagnet and the receipt of the predetermined codecombination of signals servesto disconnect the drive motor from itscurrent source.

A more complete understanding of the invention may be had by referenceto the following detailed description when considered in conjunctionwith the accompanying drawing wherein the single figure comprises aschematic illustration of the mechanism comprising a preferred form ofthe invention.

In the drawing, a motor 1 is shown which may drive a printing telegraphreceiver unit of the type illustrated in Patent No. 2,505,729, issuedApr. 25, 1950, to W." J. Zenner. In this. receiver there is provided aselector magnet 2 which is the equivalent of the selector magnet'13 ofsaid Zenner patent. In addition to the motor 1 and selector magnet 2 thereceiver is equipped with a function control mechanism of the typedisclosed in Patent No. 2,667,533 issued Jan. .26, 1954, to W. J. Zennerwhich function control mechanism comprises a function pawl 3 and afunction operating lever 4 which are the equivalent of the function pawl244 and function operating lever 246 of Patent No. 2,667,533 mentionedhereinbefore. These two patents disclose a suitable receiver of thegeneral type to which the present invention pertains and areincorporated herein by reference as though completely described indetail.

The motor 1 is designed to be supplied with current from a suitablevoltage source 5. Upon the receipt in the receiver of a spacing linesignal followed, after a suitable interval, by a marking signal, themotor will be started and as disclosed in detail in the patent to W. J.Zenner, 2,505,729, the selector magnet 2 will respond to signals from atelegraph signal line 6. In the normal condition of the telegraph line 6a marking condition is maintained, that is, current is applied to theline when no messages are being transmitted and this current willmaintain the selector magnet 2 energized.

In order to initiate a receiving operation of the receiving printer, themotor 1 must be started before signals are transmitted over the line 6to the printer and as just pointed out this initiation of the operationof the motor 1 will take place upon the receipt of a spacing signal overthe line followed by a marking signal. In order to eifect this operationa rotary switch is provided which comprises a slow to releaseelectromagnet 7 having an armature 8 which upon energization of theelectromagnet 7 will move a pawl 9 to the position shown in the drawing.Positioned for cooperation with the pawl 9 is a ratchet 10 fixed to ashaft 11 which drives three brushes 12, 13 and 14 step-by-step overswitch contacts 12-1 through 12-8, 13-1 through 13-8 and 14-1 through14-8, respectively, in unison.

In the normally quiescent condition of the telegraph line 6 a markingcondition will prevail whereby current will flow from the line 6 throughthe selector magnet 2, the contact 13-1, brush 13, contact 13-5, throughthe winding of the electromagnet 7 and back to the other side of thesignal line. Thus, when no messages are being transmitted over the line,that is, when the apparatus is in its normal condition, theelectromagnet 7 will be held energized in series with the selectormagnet 2. This circuit will extend from one side of the line 6 throughthe selector magnet 2, brush 13, interconnected contacts 13-1 and 13-5,over a lead 20 through the actuating electromagnet 7 and a lead 21 tothe other side of the signal line 6. With the rotary switch in thisposition the brush 14 will be in a position where it is in contact withcontacts 14-1 and 14-5 thus holding open the circuit from the 117 voltA.C. source at 5 to the motor 1. Similarly, the brush 12 will be incontact with contacts 12-1 and 12-5 to maintain an open circuit at thisbrush.

When a spacing signal is received over the line 6 the selector magnet 2will be deenergized and the just described circuit, through brush 13 andleads 20 and 21, will be broken to release the actuating electromagnet7, provided the break in the circuit or spacing pulse is of sufiicientduration. The electromagnet 7 is made slow to release so that it willnot react to line hits such, for example, as might be caused bylightning. If, after a proper interval of time, the signal line isreturned to a marking or current condition after the electromagnet 7 hasbeen released, the pawl 9 will be actuated and will step the ratchet 10one step due to the release and reenergization of the electromagnet 7.The energization of the electromagnet 7 will step the ratchet one stepto move the brushes 12, 13 and 14 to the position where they willinterconnect their respective contacts 4 and 8, that is, the brush 12will interconnect contacts 12-4 and 12-8; brush 13 will interconnectcontacts 13-4 and 13-8; and brush 14 will interconnect contacts 14-4 and14-8. This will break the series connection between the selector magnet2 and the actuating electromagnet 7 at brush 13 and will complete acircuit from the source 5 through contact 14-8, brush 14, contact 14-4and through the motor 1 to initiate operation of the motor. 1

' On this first operation of the electromagnet 7, that is,

upon its release and re-energization, the brush 13 will interconnect itscontacts 13-4 and 13-8 to prepare a circuit from one side of the signalline 6 through the selector magnet 2, a lead 22, contact 138, brush 13,contact 13-4 and back to the other side of the signal line 6 throughlead 23. This will condition the selector magnet 2 to receive marking orspacing signals and respond thereto to control the printing telegraphreceiver. The brush 12 in moving to position to interconnect itscontacts 12-4 and 12-8 will complete a circuit from one side of thewinding of the actuating electromagnet over lead 21 through contact1-28, brush 12, contact 12-4 and a lead 24 to one side of an auxiliarysource of current 25, the other side of which is connected to a movablecontact 26.

The movable contact 26 will remain in the position shown in the drawingduring the reception of code combinations of signals representingmessages but upon the receipt of a predetermined code combination ofsignals, the function pawl 3 will be operated and as a consequencethereof will rock the function operating lever 4 in a counterclockwisedirection whereby the contact 26 will be moved to engage a stationarycontact 27 that is connected through a lead 28 to the opposite side ofthe actuating electromagnet 7. This will cause the operation of theelectromagnet 7 which had been deenergized when the series circuit forit and the selector magnet 2 was broken. This will cause the brushes 12,13 and 14 to be moved into position to interconnect their respectivecontacts 12-3 and 12-7, 13-3 and 13-7, and 14-3 and 147, respetcively,thus to restore the circuit to the normal condition where the motor willbe disconnected from its current source 5. The electromagnet 7 willagain be connected in series with the selector magnet 2 and the receiverwill be in a quiescent condition awaiting the receipt of a spacingsignal of relatively long duration followed by a marking signal to againstart the printer motor 1.

Although a specific embodiment of the invention is shown in the drawingsand described in the foregoing specification, it will be understood thatinvention is not limited to the specific embodiment described but iscapable of modification and rearrangement and substitution of parts andelements without departing from the spirit of the invention.

What is claimed is:

1. A motor control circuit for printing telegraph apparatus having aselector magnet connected to a transmission line for controllingprinting and function operations of the apparatus and also having amotor for supplying power to effect such controlled operationscomprising (a) switching means having a normally energized drivingmagnet operable upon de-energization followed by re-energization forswitching a plurality of connections from one condition to another,

(b) first circuit means controlled by said switching means for supplyingpower to said motor when said switching means is in said othercondition,

() second circuit means controlled by said switching means for normallyconnecting said selector magnet and said driving magnet in series withsaid transmission line when said switching means is in said onecondition and operable to break said series connection and establishanother path to connect the selector magnet to the transmission linewhen said switching means is in said other condition,

(d) third circuit means controlled by said switching means for preparingan alternate circuit path to said driving magnet when said switchingmeans is in said other condition,

(e) an auxiliary source of current in said third circuit means, and

(f) signal responsive means for completing said alternate circuit fromthe path prepared by said third circuit means.

2. A motor control circuit for printing telegraph apparatus having aselector magnet connected to a transmission line for controllingprinting and function operations of the apparatus and also having amotor for supplying power to effect such controlled operationscomprising (a) a multi-brush rotary switch having a driving magnet forstepping said brushes from one position to another in unison,

(b) first circuit means including one of said brushes in said one of itspositions for supplying power to said motor,

(c) second circuit means including a second of said brushes in saidother position for establishing a circuit path to connect said selectormagnet and said driving magnet in series with the transmission line andin said one position to break said series connection and establishanother path to connect only the selector magnet to the transmissionline,

((1) a third circuit means including a third of said brushes in said oneposition for preparing an alternate circuit path to said driving magnet,

(e) an auxiliary source of current in said third circuit means, and

(f) signal responsive means for completing said alternate circuit overthe path prepared by said third brush.

3. A motor control circuit for printing telegraph apparatus having aselector magnet connected to a transmission line for controllingprinting and function operations of the apparatus and also having amotor for supplying power to effect such controlled operationscomprising (a) a three brush rotary switch having a driving magnetoperable upon de-energization followed by reenergization for steppingsaid brushes from one position to another in unison,

(b) circuit means including one of said brushes for supplying power tosaid motor,

(c) circuit means including a second of said brushes for normallyestablishing a path to connect said selector magnet and said drivingmagnet in series in the transmission line and operable to break saidseries connection and establish another path to connect only theselector magnet to the transmission line,

(d) a third circuit means including the third of said brushes forpreparing an alternate circuit path to said driving magnet,

(e) an auxiliary source of current in said third circuit means, and

(f) signal responsive means for completing said alternate circuit overthe path prepared by said third brush.

4. A motor control circuit for printing telegraph apparatus having aselector magnet connected to a transmission line for controllingprinting and function operations of the apparatus and also having amotor for supplying power to effect such controlled operation comprising(a) an electromagnet,

(b) a plurality of switching devices actuated by said electromagnet uponde-energization thereof followed by re-energization thereof,

(c) a plurailty of circuit connections associated with each of saiddevices,

((1) circuit means connected to the circuit connections associated withone of said devices for connecting and disconnecting said motor to asource of power,

(e) circuit means connected to another plurality of circuit connectionsassociated with another of said devices for normally maintaining aseries connection from the signal line through the selector magnet andsaid electromagnet, and

(f) circuit means connected to the plurality of circuit connectionsassociated with a third of said devices and responsive to codecombinations of signals on said line for connecting an alternate sourceof current to actuate the electromagnet.

5. A motor control circuit for printing telegraph apparatus having aselector magnet connected to a transmission line for controllingprinting and function operations of the apparatus and also having amotor for supplying power to effect such controlled operationscomprising (a) an electromagnet,

(b) pawl and ratchet means actuated by said electromagnet,

(c) a plurality of brushes connected to said pawl and ratchet means foractuation thereby,

(d) a plurality of groups of contacts, a separate group being associatedwith each of said brushes,

(e) circuit means connected to the contacts associated with one of saidbrushes for connecting and disconnecting said motor to a source ofpower,

(f) circuit means connected to another group of contacts associated withanother brush for normally maintaining a series connection from thetransmission line through the selector magnet and said electromagnet,and

(g) circuit means connected to yet another group of contacts associatedwith a third brush and responsive to code combinations of signals onsaid line for connecting an alternate source of current to actuate theelectromagnet.

6. A motor control circuit for printing telegraph apparatus having aselector magnet connected to a transmission line for controllingprinting and function operations of the apparatus and also having amotor for supplying power to effect such controlled operationscomprising (a) a stepping switch including an electromagnet,

(b) first circuit means connectable by said switch and operative in oneof the stepped positions of the switch for normally connecting saidelectromagnet in series with said selector magnet to hold saidelectromagnet energized, said first circuit means being effective in asecond position of said switch for breaking the series connectionbetween the selector magnet and the electromagnet,

(c) second circuit means connectable by said switch and operative insaid one position for normally disconnecting said motor from a powersource, said second circuit means being operative in said secondposition for connecting said motor to its power source.

(d) an auxiliary power supply,

(e) a third circuit means connectable by said switch and operative insaid one position for disconnecting said electromagnet from saidauxiliary power source,

(f) said third circuit means in said second position being operative toprepare an operating path from the auxiliary power source to theelectromagnet, and

(g) means responsive to code combinations of signals for completing thethus prepared circuit.

7. A motor control circuit for printing telegraph apparatus having amotor for supplying power to the ap- 5 paratus connected to a signalline and including (a) an electromagnet,

(b) a plurality of switching devices actuated by said electromagnet upondeenergization thereof followed by re-energization thereof,

(c) circuit connections associated with each of said 10 devices,

(d) circuit means connected to the circuit connections associated with afirst one of said devices for connecting and disconnecting said motor toa source of power,

(e) means connected to first circuit connections associated with anotherof said devices for causing the electromagnet to be controlled inaccordance with signals present on the signal line, and

(f) means connected to second circuit connections associated with one ofsaid devices other than said first one of the devices for energizing theelectromagnet from a separate source of current irrespective of thesignals present on the signal line.

8. A motor control circuit for printing telegraph apparatus connected toa transmission line and having a motor for supplying power to theapparatus including (a) an electromagnet,

(b) pawl and ratchet means actuated by said electromagnet,

(c) a plurality of brushes connected to said pawl and ratchet means foractuation thereby,

(d) a plurality of contacts associated with each of said brushes,

(e) circuit means connected to the contacts associated with a first oneof said brushes for connecting and disconnecting said motor to a sourceof power,

(f) means connected to contacts associated with another brush forcausing the operation of the electromagnet to be controlled by signalsappearing on the transmission line, and

(g) means connected in series with contacts associated with a brushother than the first brush for providing an alternate path from aseparate source of current for actuating the electromagnet.

References Cited by the Examiner UNITED STATES PATENTS 2,649,497

NEIL C. READ, Primary Examiner.

THOMAS A. ROBINSON, Examiner.

8/1953 Munck 1784.1

1. A MOTOR CONTROL CIRCUIT FOR PRINTING TELEGRAPH APPARATUS HAVING ASELECTOR MAGNET CONNECTED TO A TRANSMISSION LINE FOR CONTROLLINGPRINTING AND FUNCTION OPERATIONS OF THE APPARATUS AND ALSO HAVING AMOTOR FOR SUPPLYING POWER TO EFFECT SUCH CONTROLLED OPERATIONSCOMPRISING (A) SWITCHING MEANS HAVING A NORMALLY ENERGIZED DRIVINGMAGNET OPERABLE UPON DE-ENERGIZATION FOLLOWED BY RE-ENERGIZATION FORSWITCHING A PLURALITY OF CONNECTIONS FROM ONE CONDITION TO ANOTHER, (B)FIRST CIRCUIT MEANS CONTROLLED BY SAID SWITCHING MEANS FOR SUPPLYINGPOWER TO SAID MOTOR WHEN SAID SWITCHING MEANS IS IN SAID OTHERCONDITION, (C) SECOND CIRCUIT MEANS CONTROLLED BY SAID SWITCHING MEANSFOR NORMALLY CONNECTING SAID SELECTOR MAGNET AND SAID DRIVING MAGNET INSERIES WITH SAID TRANSMISSION LINE WHEN SAID SWITCHING MEANS IS IN SAIDONE CONDITION AND OPERABLE TO BREAK SAID SERIES CONNECTION AND ESTABLISHANOTHER PATH TO CONNECT THE SELECTOR MAGNET TO THE TRANSMISSION LINEWHEN SAID SWITCHING MEANS IS IN SAID OTHER CONDITION, (D) THIRD CIRCUITMEANS CONTROLLED BY SAID SWITCHING MEANS FOR PREPARING AN ALTERNATECIRCUIT PATH TO SAID DRIVING MAGNET WHEN SAID SWITCHING MEANS IS IN SAIDOTHER CONDITION, (E) AN AUXILIARY SOURCE OF CURRENT IN SAID THIRDCIRCUIT MEANS, AND (F) SIGNAL RESPONSIVE MEANS FOR COMPLETING SAIDALTERNATE CIRCUIT FROM THE PATH PREPARED BY SAID THIRD CIRCUIT MEANS.